Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4e4e1308045b4cb8a4753c4e4e7872ab920a6ca8f2aa49065bd0e44e825d33' 
  AND token = 'jxFKbTnNMBehxSrhLGkEKCDocmieon57LLizdfs7UmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}